17.1 Exponents and Logarithms Mapping Function: exp (x) Compute e^x for each element of x. To compute the matrix exponential, see Linear Algebra. See also: log. Mapping Function: expm1 (x) Compute exp (x) - 1 accurately in the neighborhood of zero. See al

log b (x / y) = log b x - log b y EX: log(10 / 2) = log(10) - log(2) = 1 - 0.301 = 0.699. If there is an exponent in the argument of a logarithm, the exponent can be pulled out of the logarithm and multiplied. log b x y = y × log b x EX: log(2 6) = 6 ×

Logarithm of 1. The base b logarithm of one is zero: log b (1) = 0. For example, teh base two logarithm of one is zero: log 2 (1) = 0. See: log of one. Logarithm of infinity. The limit of the base b logarithm of x, when x approaches infinity, is equal to